Thank you for that clear statement of your prejudice. Of course, it just about disposes of your credibility in addressing this subject.
The South did not destroy the Union, and it did not attempt to destroy the Union.
The South did not destroy the Constitution, but instead emulated it in drawing their own.
The South did not "love" slavery. It lived with it -- which as any married person can tell you, isn't even close to the same thing.
Since the Union was all the states which composed it the Slavers tried to destroy it through insurrection.
Since, according to Madison, once a state entered the Union it was forever attempting to leave was a violation of the Constitution thus the Slavers tried to destroy the Constitution.
Slavers loved slavery since their well being was tied to it. I am sorry to hear you are in a loveless marriage that may explain many things.
Personally I wish daily my late wife was still here since I loved her more than life itself.
Some sure did:
"Our position is thoroughly identified with the institution of slavery - the greatest material interest of the world." -- Mississippi Secession Declaration